Kyocera TASKalfa 3050ci Service Manual page 306

Code Contents
7800 Broken outer temperature
sensor 1 wire
The sensor input sampling is
greater than 255.
7810 Short-circuited outer tem-
perature sensor 1
The sensor input sampling is
less than 0.
7901 Drum K EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
Mismatch of reading data from
two locations occurs 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
7902 Drum C EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
Mismatch of reading data from
two locations occurs 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
Causes
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Outer temperature sensor 1 and front PWB
(YC16)
Front PWB (YC2) and engine PWB (YC10)
Defective outer Replace outer temperature sensor 1.
temperature sen-
sor 1.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation (see page 1-5-54).
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Outer temperature sensor 1 and front PWB
(YC16)
Front PWB (YC2) and engine PWB (YC10)
Defective outer Replace outer temperature sensor 1.
temperature sen-
sor 1.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation (see page 1-5-54).
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Drum PWB K and front PWB (YC7)
Front PWB (YC2) and engine PWB (YC10)
Defective drum Replace the drum unit K (see page 1-5-36).
PWB K.
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Drum PWB C and front PWB (YC12)
Front PWB (YC2) and engine PWB (YC10)
Defective drum Replace the drum unit C (see page 1-5-36).
PWB C.
1-4-66
2LK/2LN/2LM/2LC
Check procedures/
corrective measures